Scraping assembly for road planer



May 21, 1963 v. E. TRANA 3,090,140

SCRAPING ASSEMBLY FOR ROAD PLANER. Filed Feb. 27, 1961 3 Sheets- Sheet 1May 21, 1963 v. E. TRANA 3, 40

SCRAPING ASSEMBLY FOR ROAD PLANER Filed Feb. 27, 1961 5 Sheets-Sheet 21M yil mff/zama May 21, 1963 v. E. TRANA SCRAPING ASSEMBLY FOR ROADPLANER 5 Sheets-Sheet 3 Filed Feb. 2'7, 1961 FIG.3

United States Patent 3,698,148 SCRAPENG ASSEMBLY FGR RGAD PLANERValdemar Emanuel Trana, 9 Gjuterivagen, Fagersta, Sweden Filed Feb. 27,1961, See. No. 92,659 Claims priority, application Sweden Feb. 29, 196i?Claims. (Cl. 37-143) This invention relates to a scraping assembly forroad planing machines.

The scraping assembly according to the invention is substantiallycharacterized in that it comprises a resilient scraping member and aninelastic backing support, the said resilient scraping member along aportion of its rear surface being supported by the said backing supportwithout there being a rigid connection between the scraping member andthe backing support.

Owing to the said backing support, the use of thin and highly resilientscraping members is rendered possible.

The said resilient scraping member consists preferably of a rolled steelsection, preferably sheet steel, and is in fixed or preferablydetachable connection with the blade of the road-planing machine. Byattaching the resilient member to the planer blade such that it isinserted in an aperture having substantially parallel curved contactsurfaces the resilient scraping member can be mounted and removed in avery easy manner. A preferable embodiment is to retain the scrapingmember in attachment to the planer blade merely by designing anddimensioning the aperture in such a manner that the resilience of thescraping member is suificient to retain the scraping member duringtransport in said aperture, but not greater than to allow the removal ofthe scraping member by means of blows with a hammer.

The backing support may possibly be constructed such that it can serveas ice cracker, in which case it should preferably comprise a number ofice cracking teeth ac cording to Norwegian patent specification 87,241and Finnish patent specification 28,912 and Canadian patent application684,256 respectively. Hereby the said assembly can be used for planingand plowing with the resilient scraping member in operation, as well asfor ice cracking with the icecracker-shaped backing support inoperation. In the latter case, the resilient scraper member ispreferably removed. The said rapid change of functions thus renderedpossible is of particular advantage in thawing weather and in citieswhere road planers often are used for plowing or removing snow slush.

When the backing support is not intended to be used for icecrackingpurposes, it can be constructed such that it is displaceable in itslongitudinal direction, in which case, however, it must have a limitingposition in the downward and possibly also in the upward direction. Theobject of the latter arrangement is to render the backing supportpossible to adjust itself according to the distance of the assembly tothe road surface. When the resilient scraping member is being taken intooperation, or at the later time when the resilient member had beensubjected to a certain abrasion Wear, the backing support reaches downto the road surface and slides on the same. During the continuous Wearof the resilient scraping member, the backing support raises owing toits continuous sliding on the road surface, the lower edge of thebacking support being in level with the lower edge of the resilientscraping member.

The accompanying drawings show examples of different embodiments of theinvention, FIGS. 1-2 showing a longitudinal section, and FIG.-3 showinga horizontal view.

Referring to the figures, 1 designates the resilient scraping member,supported in operation by the backing support 2, 2' and 2 respectively.Both the scraping member and the support are attached to the planerblade 3, whereof the resilient scraping member is attached such that itis inserted in the aperture 4. In the embodiment according to FIG. 1,the backing support 2 serves as ice cracker, while the embodimentaccording to FIG. 2 the backing support 2' can adjust itself in itslongitudinal direction according to the distance of the assembly fromthe road surface. The backing support 2 is enclosed in a hole 5 in theassembly, which hole is designed such that it Within its sectionprovides space for the entire lower portion of the backing support. Thelatter applies also to the embodiment shown in FIG. 3 where, however,the backing support 2 has the form of a cam with two teeth.

The arrow A indicates the direction of motion of the assembly.

What I claim is:

1. A road-planer blade assembly comprising a planer blade, a resilientscraper blade having a curved upper edge portion, means mounting thesaid upper edge por tion of said scraper blade on said planer blade,said mounting means having a recess bounded at its inner portion bysurfaces curved similarly as the upper edge portions of said scraperblade and said upper portion of said scraper blade being accommodated insaid recess and being retained therein by said curvature of its upperedge portion and of the inner portion of the Walls of said recess, and arigid backing support mounted on said planer blade and extendingdownwardly in rear of said scraper blade and freely engaging the backface of said scraper blade.

2. The combination as claimed in claim 1, and in which said backingsupport comprises a plurality of downwardly projecting tooth-like prongsfor use for cracking ice when said scraper blade is removed.

3. The combination as claimed in claim 1 and means limiting movement ofsaid backing support in the vertical direction, and means for adjustingthe vertical position of said support according to the distance of theroad-planer blade assembly from the road surface.

4. The combination according to claim 3 and in which the mounting ofsaid backing support on said planer blade is sufiiciently loose as toallow said backing support to rise relative to said planer blade as thescraper blade wears away and said backing support engages the roadsurface.

5. The combination according to claim 1 and in which said backingsupport is provided with at least two downwardly extending teeth, andbecomes thinner downwardly.

References (Iited in the file of this patent UNITED STATES PATENTS17,332 Lashbrooks May 19, 1857 285,594 Elliott Sept. 25, 1883 731,762Draeger June 23, 1903 910,985 Beach Jan. 26, 1909 1,574,725 BasmaisonFeb. 23, 1926 1,799,204 Wily Apr. 7, 193-1 2,105,960 Wolfe Jan. 18, 1938FOREIGN PATENTS 88,474 Norway Dec. 10, 1956

1. A RAOD-PLANER BLADE ASSEMBLY COMPRISING A PALNER BLADE, A RESILIENTSCRAPER BLADE HAVING A CURVED UPPER EDGE PORTION, MEANS MOUNTING THESAID UPPER EDGE PORTION OF SAID SCRAPER BLADE ON SAID PLANER BLADE, SAIDMOUNTING MEANS HAVING A RECESS BOUNDED AT ITS INNER PORTION BY SURFACESCURVED SIMILARLY AS THE UPPER EDGE PORTIONS OF SAID SCRAPER BLADE ANDSAID UPPER PORTION OF SAID SCRAPER BLADE BEING ACCOMMODATED IN SAIDRECESS AND BEING RETAINED THEREIN BY SAID CURVATURE OF ITS UPPER EDGEPORTION AND OF THE INNER PORTION OF THE WALLS OF SAID RECESS, AND ARIGID BACKING SUPPORT MOUNTED ON SAID PLANER BLADE AND EXTENDINGDOWNWARDLY IN REAR OF SAID SCRAPER BLADE AND FREELY ENGAGING THE BACKFACE OF SAID SCRAPER BLADE.